feat: add deployment model classes

[jhamon]

Summary

Add deployment model classes for different index deployment configurations.

Closes SDK-103

Classes

Class	Deployment Type	Key Parameters
ServerlessDeployment	serverless	cloud, region
ByocDeployment	byoc	environment
PodDeployment	pod	environment, pod_type, replicas, shards

Usage Example

from pinecone import ServerlessDeployment, ByocDeployment, PodDeployment

# Serverless deployment
pc.create_index(
    name="my-index",
    schema=schema,
    deployment=ServerlessDeployment(cloud="aws", region="us-east-1"),
)

# BYOC deployment
pc.create_index(
    name="my-index",
    schema=schema,
    deployment=ByocDeployment(environment="aws-us-east-1-b92"),
)

# Pod deployment
pc.create_index(
    name="my-index",
    schema=schema,
    deployment=PodDeployment(
        environment="us-east-1-aws",
        pod_type="p1.x1",
        replicas=2,
    ),
)

Test Plan

• Unit tests for ServerlessDeployment serialization
• Unit tests for ByocDeployment serialization
• Unit tests for PodDeployment with various options
• mypy type checking passes

---

Note

Low Risk
Low risk: this PR only adds new model/dataclass types and exports them; it doesn’t change existing request flows, but downstream code may start relying on the new to_dict serialization format.

Overview
Adds new deployment configuration dataclasses (ServerlessDeployment, ByocDeployment, PodDeployment) with to_dict() serialization and a Deployment union type in db_control/models/deployment.py.

Exports these types through pinecone.db_control.models and top-level pinecone lazy imports, and adds unit tests validating constructor defaults and to_dict() output across deployment variants.

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